Patent GB-515981-A (GB)
Abstract: 515,981. Dyeing and printing. CALCO CHEMICAL CO., Inc. July 7, 1938, No. 20133. Convention date, July 12, 1937. [Classes 2 (iii) and 15 (ii)] The stabilized diazo compounds made by reacting diazotized amines with guanylurea or a derivative thereof are used for producing dyeings and printings on textile fibres. Suitable amines are those listed in Specification 515,980, and guanylurea-N-sulphonic acid .and' N-nitroguanylurea are particularly useful derivatives of guanylurea. The stabilized diazo compounds may be mixed with coupling components, e.g., naphthols, pyrazolanes, hydroxybenzofluorenones, benzoylnaphthols, and arylides of 2:3-hydroxynaphthoic acid and its 5:6:7:8- tetrahydro derivative, of 2-hydrogy-3-anthroic acid, of methyl- and dimethyl-salicylic acids, of hydroxy-carbozole- and hydroxy-benzo-carbpzole-carboxylic acids, of acetoacetic acid, of furoylacetic acid, , of terephthaloyl-bis-acetic acid, of hydroxydibenzofuran-carboxylic acids and of hydroxy-dibenziothiophene-carboxylic acids. Assistants, e.g., starches, gums, alkalis, wetting and dispersing agents may also be incorporated in the mixtures. The textile material may be printed or impregnated with the mixture and then treated with an acid, preferably a weak acid such as formic or acetic acid, at elevated temperature. The coupling component and diazo compound, instead of being mixed, may be applied separately in either order. When the coupling component and diazo compound are printed as a mixture, the goods may, if sufficiently acid resistant (e.g. in the case of animal fibres), be previously impregnated with an acid substance, such as sulphuric acid or sodium bisulphate, and the prints developed by steaming. Alternatively, in the case of.materials which are not acid resistant (e.g. cellulose fibres), the .goods may be impregnated with a material which liberates acid on steaming, such as ammonium sulphate or esters of tartaric, succinic or malonic acid. The acid yielding material may also be mixed with the printing paste. The process of the invention may also be used for simultaneous or separate printing with sulphuric acid esters of leuco-vat dyes. In, examples : (1) the stabilized diazo compound from 2-methyl-5-chloraniline and guanylurea is mixed with the o-toluidide of 2:3-hydroxynaphthoic acid, deflocculated by grinding with the sodium salt of disulphodinaphthylmethane, mixed with trisodium phosphate .and. dextrin, and dried ; the colloidalized product is then pasted with sodium xylenesulphonate, caustic soda, ethylenegylcol monoethyl ether, starch-gum tragacanth, printed on cotton, and developed by steam containing acetic acid vapours, (2) the o-toluidide of 2:3- hydroxynaphthoic acid is blended with the diazo compound from diazotized 2-methyl- 5-chloraniline and quanylurea-N-sulphonic acid, pasted with ethyleneglycol monoethyl ether, caustic soda and starch-gum tragacanth, printed on cotton and developed as in (1), or by immersion in a warm bath containing acetic and formic acids and Glauber's salt; instead of the o-toluidide, the anilide, o-anisidide or o-phenetidide of 2:3-hydroxynaphthoic acid or acetoacetic-o-tolidide may be used, (3) cotton is padded with the o-toluidide of 2:3-hydroxy-. naphthoic acid, dried, printed with a paste containing the stabilized diazo compound from 2-methyl-5-chloraniline and guanylurea-N- sulphonic acid, and developed by steam containing acetic acid vapours, (4) cotton is padded with the o-toluidide of 2:3-hydroxynaphthoic acid and dyed from a bath containing the diazo compound from 2-methyl-5-chloraniline and guanylurea-N-sulphonic acid, acetic and formic acids and Glauber's salt, (5) cotton is printed as in example (2) but using the 2:5-dimethoxyanilide of 2:3-hydroxynaphthoic acid and the diazo compound from 2-nitro-4-methylaniline and guanylurea-N-sulphonic acid, (6) as in example (2), but using the diazo compound from 3-chloraniline, and (7) as in example (2), but using the diazo compound from tetrazotized benzidine and guanylurea-N-sulphonic acid.